relationship, it's carter/ford, mcenroe/connors, whatever it is, when you're on the court after the fact, you're like, hey, you're more like me than not. we're bonding. for good or bad, we've been put together. and it's always going to be like that. >> from rivals to partners, the evolution of this friendship has been something to watch over the last four-plus years. and is now entering a new phase as president obama takes on his send term, and hillary clinton heads towards her last day as a top member of his cabinet. kate bolduan, cnn, washington. >> so now hillary clinton is leaving the state department, what is next for her. let's bring in chief political correspondent candy crowley and john king. in 2008, barack obama, hillary clinton were bitter enemies battling a tough primary season. now fast forward, they're doing this high-profile joint interview. what do you make of how their relationship has evolved?